package base.oop;

import com.sun.xml.internal.ws.util.StringUtils;

/**
 * @Author Fizz Pu
 * @Date 2021/4/5 下午4:05
 * @Version 1.0
 * 失之毫厘，缪之千里！
 */
public class ExerciseP326 {

}

class StrProcess {
    public String handle(String str){
        if(str == null){
            return str;
        }
        return null;
    }
}